Mutual inclination in multi-planet systems offers key insights into their dynamics and formation. The WASP-148 system, hosting a transiting hot Jupiter and a non-transiting warm Jupiter, provides a unique study case for these short-period gas giants. Our research reveals an aligned orbit of WASP-148b with its host star using Rossiter-McLaughlin effect measurements. Furthermore, our data modeling suggests a mutual inclination of around 26.5 degrees and a stable configuration, differing from previous studies. This analysis highlights WASP-148's precarious stability and possible transition phase, lending support to a unified theory of exoplanet formation linking compact multi-planet and isolated-Jupiter systems.